Piston ring



J. REID.

PISTON RING.

APPLICATION FILED Nov. 26. 1919.

1,405,331, Patented Jan. 31, 1922.

Fig.1.

s s eeme? To allwh-om it mag concern:

Be it known that I, JAunsR-nm, a citizen of the UnitedS-tates, residing at @yracuse, in the county ofOnondagaandqState of New York, have invented certain ,new' and useful Improvements in Piston Rings; {and ,I do hereby-declare. t GZiOllOWing to be a full, clear, and exactdescription of the invention, such as will enable others; skilledin'the art to which it appertains to make and use the same.

The present invention relates to improvements in piston rings, and it more specifically relates to an improved joint made be: tween the free ends of the split ring.

An object of the present invention is'to provide an improved piston ring in which the joint between the free ends of the same forms a more perfect seal against the escape of gases than has been heretofore attained with prior forms of joints.

Another object of the invention is to produce a joint that is more quickly produced and which will be more mechanically uniform and accurate than present forms of joints. i

A further object of the present invention lies in providing a joint that will be stronger and more rigid and less likely to sustai breakage than present joints.

In the accompanying drawings forming a part of this application, and in which similar reference symbols indicate corresponding parts in the several views:

Figure 1 is a fragmentary elevational view of a piston head shown equipped with two improved piston rings constructed in accordance with the present invention. 7

Figure 2 is a fragmentary cross section of the piston with the piston ring sprung out from the groove in the piston.

Figure 3 is a cross sectional view through the piston with the piston ring in place in 1 the groove.

Figure 4 is a fragmentary plan view of the amiss eEI-e,oesYRecesE,-ifiswsome -Applica tion fil ed- November 26,; 191 [serial indent-vie.

s nate-ea i pi venting theescape of. gases past'gthepiston.

The present} invention lies more particularly/in the joint formed between the two ep ten s f.--;bhar e r n -st dcordance with, this, invention the of the ring 3 are cut away partially tion; l a g tensi e 1%. ny n a a m a t n es Q11 the ethe and hese tqns esz e g eifs te ema Ma t t o rl pwhe the-tw jends efr h spl n 3 are allowed to come together. i The under sides of the tongues 4 and 5 are rounded off or; curved as indicated at 6.

Laterally of the tongue 4 the portion cut away is so removedas to leave a ledge? also of rounded or curved configuration corresponding to the curvature of the under face 6 of the tongue 5, so that the two match, and when brought together, as indicated in Figure 3, the rounded under face 6 of the tongue 5 fits against the rounded ledge 7.

The forward endof the ledge 7 has a shoulder 8 whichextends beneath the under face 6of the tongue, and the ledges 8 of the opposite ends are adapted to come together when the ring is wholly contracted. Figure 3 shows the ring in a slightly expanded condition.

The curved parts 6 and 7 are very important and secure improved results with a joint of the character above described, and while it is probablynot essential that the curvature be the same as is given these.

parts in the drawings, yet this same curvature, is attended with valuable results.

One particular advantage derived from the curved tongue and ledge follows from.

the'fact that when the ring 3 expandsso that the opening of the joint, measured on caused by usual wear; the gap between the tongue and its seat at the inside circumference of the ringis so slight as to still form the. outside jcircumference, exceeds that for the greatest thickness, or cross section, I I

of the tongues being the parts adjacent the ring so that the tongues are more rigid and less likely to bebroken off. Moreover, an

exceedingly long lap of the tongues is obtained on the outer-diameter or working sur- A face of the piston ring, while on theinner diameter of the ring .no lap. joint occurs.

The long overlapping joint prevents the escape of gases-across the face of the ring. I I

'rinIg or the groove in the A joint made in this manner will also remain useful even after considerable wear,

as the curved faces will tend to cause the two ends of the joint to ride together with greater facility.

The particular form of the ends of the ring is such as to facilitate the placing of the ring on the piston head and to render it easy to move the same to place in the groove 2; while also facilitating the removal of the piston ring vfrom the groove without incurring the likelihood of damaging either the piston head.

e ring may very readily be made by removing a section of metal from a one piece ring, which can all be accomplished in two operations.

It is obvious that those skilled inthe art may vary the details of construction and arrangements of parts without de arting from the spirit of my invention, an therefore I do not wish to be limited to such features, except as may be required by the claim.

ll claim: As an article of manufacture, a split packing ring made of a single piece of resilient metal, having its body portlon substantially rectangular in cross section, and having the two ends provided with reversely disposed tongues forming, respectively, the side walls of grooves each in the form of an arc of a circle, the lower face of each tongue being shaped to register with the curve of the opposite groove, and the two ends of the ring being each provided with a shoulder at the base of the corresponding tongue and at the lower end of the corresponding groove, the said shoulders having plane abutting surfaces radial to the circumferonce of the ring.

JAMES new. 

